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Does either of the equations have an isolated variable in it?
(13,-5)
When solving a system of equations using substitution, there are three steps.
(II):y= 8-x
(II): Distribute -1
(II):Subtract term
(II):LHS+6=RHS+6
(II): Rearrange equation
(I):x= 13
(I): Subtract term
(I), (II): x= 13, y= -5
(II): a-(- b)=a+b
(I), (II): Add and subtract terms